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114 lines
2.8 KiB
C
114 lines
2.8 KiB
C
/*
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* This file is part of ixemul.library for the Amiga.
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* Copyright (C) 1991, 1992 Markus M. Wild
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* ftruncate.c,v 1.1.1.1 1994/04/04 04:30:18 amiga Exp
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*
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* ftruncate.c,v
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* Revision 1.1.1.1 1994/04/04 04:30:18 amiga
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* Initial CVS check in.
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*
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* Revision 1.1 1992/05/14 19:55:40 mwild
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* Initial revision
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*
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*/
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#define _KERNEL
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#include "ixemul.h"
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#include "kprintf.h"
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#ifndef ACTION_SET_FILE_SIZE
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#define ACTION_SET_FILE_SIZE 1022
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#endif
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#define USE_SETFILESIZE_SEEK_WORKAROUND 1
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int
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ftruncate (int fd, off_t len)
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{
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usetup;
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struct file *f;
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if (u.u_parent_userdata)f = u.u_parent_userdata->u_ofile[fd];
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else f = u.u_ofile[fd];
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int err, res;
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int omask;
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errno = EBADF;
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KPRINTF (("&errno = %lx, errno = %ld\n", &errno, errno));
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/* if this is an open fd */
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if (fd >= 0 && fd < NOFILE && f)
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{
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if (f->f_type == DTYPE_FILE)
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{
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#if USE_SETFILESIZE_SEEK_WORKAROUND
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BPTR fh;
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LONG opos;
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#endif
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if (HANDLER_NIL (f))
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{
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errno = EINVAL;
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KPRINTF (("&errno = %lx, errno = %ld\n", &errno, errno));
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return -1;
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}
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err = 0;
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omask = syscall (SYS_sigsetmask, ~0);
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__get_file (f);
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#if USE_SETFILESIZE_SEEK_WORKAROUND
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fh = CTOBPTR(f->f_fh);
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opos = Seek(fh, 0, OFFSET_BEGINNING);
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res = SetFileSize(fh, len, OFFSET_BEGINNING);
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if (res == -1)
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err = __ioerr_to_errno(IoErr());
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else if (res < opos)
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opos = res;
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if (opos != -1)
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Seek(fh, opos, OFFSET_BEGINNING);
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if (res != -1)
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#else
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res = SetFileSize(CTOBPTR(f->f_fh), len, OFFSET_BEGINNING);
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if (res == -1)
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err = __ioerr_to_errno(IoErr());
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else
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#endif
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{
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/* 15-Jul-2003 bugfix: 0 indicates success! used to return
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* whatever SetFileSize returned (new filesize) - Piru
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*/
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res = 0;
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err = 0;
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}
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__release_file (f);
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syscall (SYS_sigsetmask, omask);
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errno = err;
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KPRINTF (("&errno = %lx, errno = %ld\n", &errno, errno));
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return res;
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}
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else
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{
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errno = ESPIPE;
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KPRINTF (("&errno = %lx, errno = %ld\n", &errno, errno));
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}
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}
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return -1;
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}
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